I'm not sure about the personality trait issue. I only have the one Tux and one Tux wannabe, so I've no frame of reference. I can tell you that my wanna be is very mellow and docile, while my tux is very playful and loud. Sometimes I think Rocky the tux is singing, other times, I think he's talking. So, I don't know. Hmmmmm. I can tell you that both my kitties know they are very handsome and they are NOT modest at all.